Acrylic polymer, its use and process for producing it

Details Acrylic polymer, its use and process for producing it Acrylic polymer, its use and process for producing it

1995-11-07

1996-11-12

Smith, Jeffrey T.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526222, 5263171, C08F 202

Patent

active

055741177

ABSTRACT:
The present invention provides an acrylic polymer containing no surfactant, having little limitation in the polymer composition and being superior in heat resistance, processing operation performance and fluidity, and also provides use of the polymer and a production process. An acrylic polymer of present invention is obtained by the bulk polymerization, contains an acrylic acid-based monomer unit as a main component in its structure and has a Mn of 1,000 to 1,000,000, a glass transition temperature of -80.degree. C. or higher and a Mw/Mn ratio of 5 or less, and is appropriate for acrylic rubber, a pressure-sensitive adhesive, an alkali-soluble adhesive, an alkali-soluble film, an alkali-soluble injection molding or water ink. This polymer is produced by, in the presence of an inactive gas, carrying out the bulk polymerization of a starting material which contains a monomer component having an acrylic acid-based monomer as a main component and contains a sulfur compound of 0.001 to 20 parts by weight based on 100 parts by weight of the monomer component, and contains a polymerization initiator in the weight of one-third or less based on the sulfur compound.

REFERENCES:
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patent: 4507454 (1985-03-01), Hutton et al.
patent: 4833221 (1989-05-01), Albrecht
patent: 4851278 (1989-07-01), Enanoza
patent: 5057366 (1991-10-01), Husman et al.
patent: 5073615 (1991-12-01), Shen

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